Building structure



FIG. 1 is a view in perspective of a building structure showing my new design;

FIG. 2 is a view in perspective as seen from the left of FIG. 1 of a building structure showing my new design;

FIG. 3 is a view in perspective as seen from the top of FIG. 1 of a building structure showing my new design;

FIG. 4 is a view in perspective as seen from the right of FIG. 1 of a building structure showing my new design;

FIG. 5 is a bottom view of a building structure showing my new design; and

FIG. 6 is a plan view, with roof removed, of a building structure showing my new design. 

The ornamental design for a building structure, substantially as shown. 